APA-ийн эшлэл(7 дахь хэвлэлт)

ebrary, Inc, & Heckrath, G. (2005). Tools for assessing phosphorus loss from Nordic agriculture. Nordic Council of Ministers.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

ebrary, Inc, ба Goswin Heckrath. Tools for Assessing Phosphorus Loss from Nordic Agriculture. Copenhagen: Nordic Council of Ministers, 2005.

MLA -ийн эшлэл (9 дэх хэвлэлт)

ebrary, Inc, ба Goswin Heckrath. Tools for Assessing Phosphorus Loss from Nordic Agriculture. Nordic Council of Ministers, 2005.